Section 7.2 Using the Law of Universal Gravitation

Practice Test
      
  1.What is the orbital period for the satellite pictured in Figure 7-10?  
  a.   0.052 h  
  b.   1.6 h  
  c.   3.1 h  
  d.   170 h  
  Hint    
      
  2.When Uranus was discovered, why didn't Newton's law of gravitation correctly predict its orbit?  
  a.   Uranus was being attracted by the planet Neptune.  
  b.   Newton's law of gravitation applies only to objects on Earth.  
  c.   The period of Uranus was not known at the time.  
  d.   Newton's law could not be applied over such great distances.  
  Hint    
      
  3.If you weigh 440.0 N on Earth's surface, how much would you weigh on the planet Mars? Mars has a mass of 6.42×1023 kg and a radius of 3.40×106 m.  
  a.   557 N  
  b.   1.4×103 N  
  c.   235 N  
  d.   165 N  
  Hint    
      
  4.A satellite orbits Earth 375 km above its surface. What is its speed in orbit?  
  a.   7.61 × 103 m/s  
  b.   7.68 × 103 m/s  
  c.   7.61 × 103 m/s2  
  d.   7.68 × 103 m/s2  
  Hint    
      
  5.The __________ of an object is measured by applying a force to the object and measuring its acceleration.  
  a.   inertial mass  
  b.   resistance  
  c.   gravitational mass  
  d.   weight  
  Hint    
      
  6.If Earth began to shrink but its mass remained the same, what would happen to the value of g on Earth's surface?  
  a.   It would remain constant.  
  b.   It would decrease.  
  c.   It would be halved.  
  d.   It would increase.  
  Hint    
      
  7.A satellite orbits Earth 5.00×102 km above its surface. What is its speed in orbit?  
  a.   7.90×103 m/s  
  b.   7.61×103 m/s  
  c.   7.76×103 m/s  
  d.   5.92×103 m/s  
  Hint    
      
  8.A satellite orbits Earth 5.00×102 km above its surface. What is its period?  
  a.   15.7 h  
  b.   1.58 h  
  c.   1.43 h  
  d.   94.6 h  
  Hint    
      
  9.If you weigh 500.0 N on Earth's surface, how much would you weigh on the planet Jupiter? Jupiter has a mass of 1.90×1027 kg and a radius of 71.5×106 m.  
  a.   1.24×104 N  
  b.   1.26 N  
  c.   126 N  
  d.   1270 N  
  Hint    
      
  10.A satellite orbits Earth 375 km above its surface. What is its period?  
  a.   1.54 h  
  b.   92.1 h  
  c.   55.3 h  
  d.   16.0 h  
  Hint    
      
  11.If the satellite in Figure 7-10 were to remain above the same point on Earth, what would its orbital radius have to be changed to?  
  a.   2.2×1011 m  
  b.   1.7×1011 m  
  c.   1.3×1011 m  
  d.   1.1×1011 m  
  Hint    

 
   
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